安放楔子的作用有（）
A.有助于充填体邻面颈部的成形
B.防止形成悬突
C.稳固成形片
D.有助于恢复正常的邻接关系
E.以上均是
参考答案：E
米友仁
A monopolist will expand production until:（）
A. P = MC and the price of the product will be determined by the MC curve.
B. MR = MC and the price of the product will be determined by the demand curve.
C. P = MR and the price of the product will be determined by the ATC curve.
